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Megan was born to Andrew Kane, a wealthy business executive, and an unnamed mother. In 2000, her parents divorced when her father had a six-year affair with Katherine, a call girl, and also possibly due to his strangulation fetish. Remarrying, Andrew refused to pay alimony or child support, despite the fact he had the financial means to do so. Afterwards, she studied internationally. Though she blamed Katherine for ruining her parents' marriage, and her life, and wanted her to go away, she eventually visited her as Katherine was retiring. During the visit, she decided to buy Katherine's client list in order to prevent anyone else from betraying their families like what her father did to her and her mother. Eventually, she herself became a call girl using Katherine's list.

At some point in her career, Megan snapped and started killing. Her first and second murders were largely covered up by the victims' lawyers and the staff of the hotels where the murders took place. Hotch and the BAU are eventually called in after a third victim, Joseph Fielding, is found. Hotch arrives early on the scene, and coincidentally and unknowingly runs into her in the hotel elevator as she leaves the crime scene for another client. Sometime later, Megan meets a man named Trent Rabner, who doesn't fit her victimology. Though she apparently has no intention of killing him, she changes her mind when Trent says that his lawyers are confident that they have the FBI in their pocket. She holds him at gunpoint in a parked car and calls the BAU, requesting Hotch by name.

When she gets him on the line, Megan explains that she could trust him, but he tells her that he disappointed her. She questions him about his family life, and he tells her that his wife left him and that he tries to see his son Jack when he can, and that he is nothing like her clients. Megan rants about how Hotch was corrupt and not doing his job. He responds that he only wants to find her and urges her to turn herself in. Megan turns him down, proclaims she won't let him cover the murders up, hangs up, and shoots and kills Trent. Walking out of the parking lot, Megan calls a news station and confesses to shooting Trent in order to keep the murder from staying private. Then, she commences her endgame, confronting her father at his favorite hotel and confessing to the murders.

Andrew suggests that she turn herself in, adding that his lawyers will post bail and smuggle her out of the country. Megan is at first inclined to accept, but hesitates when Andrew requests the client list, presumably in order to hide it. Finally, Megan hands him the cellphone she kept the list on, and he leaves. Shortly before the BAU break into the room, she ingests poison through her drink. Hotch, who she developed a respect for his efforts to take care of Jack, despite his divorce, sits down next to her and offers to help her expose the men on the list. She reveals that she removed the SIM card from her cellphone before giving it to her father. Giving it to Hotch, she tells him, "How could your wife have ever left someone like you? You're the first man [she'd] met who didn't let [her] down." She then asks him to stay with her before dying. News headlines heard at the end of the episode reveal that Hotch covertly exposed the list, Andrew resigned, and the reputations of him and the other men named in the list were presumably ruined.

The unsub is an organized, methodical white female who is between the ages of twenty-five and thirty. She knows how to be discreet (like all call girls), is capable of convincingly disguising herself, is paid $10,000-$15,000 per session with her clients, and is well-versed in the world of wealth and privilege (with the team later discerning she comes from a well-off family, after looking through the contents of her penthouse). Even though she is a call girl, she does not look like one, instead passing off as a businesswoman or a coworker. Her business expenses have most likely been written off by her client's lawyers as losses, such as shoes, clothing, and jewelry. Her clients pay her in cash, but they may be also paying her in other ways such as taking care of her, giving her a new car, and even paying her medical bills. She came from a broken home, and like most prostitutes, she grew up without a father figure, likely due to him abandoning his family, and she is now turning that rage towards clients who walk out on their families.

Prostitutes usually kill for money, drugs, due to post-traumatic stress disorder or due to being coerced into doing something they do not want to do, though the BAU later realized it was the personal lives of her victims that set the unsub off (if it was a sexual act or fetish that drove her to kill her clients she would have snapped long ago and would not be charging $10,000 for sex, as an interviewed madame put it). The unsub is paid ten-thousand a night not only for sex, but for secrecy, as she knows all her clients' secrets, which they tell her during "pillow talk" (most call girls are taught to listen, as well as perform). Most of her clients are narcissistic, self-absorbed business-type men who had abandoned their families, similar to her father. Because of this, their complaints about how their wives are cheating them out of their money or how their children are nagging serves as the trigger that drives her to kill them.

The unsub wants her actions to be noticed and validated, hence her staging Joseph Fielding's body, the eyes of which she painted over (a "false signature" put there just for the BAU). If ignored, it is likely she will grow reckless and make a mistake. Being betrayed so many times over the course of her life caused her to be unable to know who to trust, which made her first murder feel all the better. Over time, she is unable to get as much satisfaction from killing and is beginning to devolve, the murders growing more personal, the M.O. and victimology changing, and her entire justification for who is worth killing and who is not is disintegrating, making it likely she could go on a spree and take out anyone she sees as a target.

Megan would poison her victims with tetramethylenedisulfotetramine (also called tetramine), a common rat poison she slipped into their drinks before having sex with them. She targeted clients who were Caucasian men in their fifties who were just like her father: wealthy business executives who divorced their wives and refused to pay alimony or child support, even though they could afford it.

Her killing of Trent Rabner, however, was highly out of character for her; she fatally shot him with a .380 Sig Sauer P232 pistol in his car, even though he had stayed faithful to his wife, who died of cancer, and didn't have any children. She then called a news network anonymously so his murder wouldn't be covered up by his lawyers. Her main reason for killing Trent was his statement about his lawyers having the FBI in their pocket and that the FBI would "play ball"; by saying this, he unknowingly suggested that her crimes would be covered up (in effect making Megan believe that the powers-that-be were trying to silence her). As such, she killed Trent because of his arrogance and also possibly because he represented those who had protected and enabled people like her father.